Unless stuttering runs in the family statistically she will grow out of it. If it becomes a struggle for her or if you're concerned it's more than normal childhood disfluency take her to a speech pathologist who specializes in stuttering. The specialty part is very important. What you can do at home in the meantime is listen to her. Don't make a big deal about how she's talking instead focus on the content. Become an active listener. Listen patiently, make normal eye contact, focus on her. If she expresses concern about her bumpy speech listen. Stuttering shouldn't be a taboo subject but at the same time the conversation has to match the maturity and comprehension of the kiddo.